BMW R90 1978-1996 WSM Service Manual Repair

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🏷️ Basic Information Identification Make: BMW Model: R90 Model Variant: R90/6 Generation Model Years Covered: 1973-1976 Codes Chassis Codes: R90/6 👋 Introduction Market Position Market Niche: Premium large-displacement touring and...

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Taper: Motorcycle

Distributeur:

UGS: 466903

Mots clés: 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 BMW Cars Misc Motorcycle R90

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Model:

Model Variant:

R90/6

Generation

Model Years Covered:

1973-1976

Codes

Chassis Codes:

R90/6

👋 Introduction

Market Position

Market Niche:

Premium large-displacement touring and sport-touring motorcycle segment

Competitive Analysis

Key Competitors:

Honda CB750, Kawasaki Z1, Moto Guzzi V7 series, Ducati 750 GT

Key Features

Defining Characteristics:

Shaft drive, boxer twin engine, robust build quality, touring comfort, reliable performance

Target Audience:

Touring riders, sport-touring enthusiasts, enthusiasts seeking reliable and capable classic motorcycles

📋 Manual Details

Coverage Areas

General Coverage:

Comprehensive service and repair for BMW R90/6 motorcycles

Page Count

Estimated Page Count:

~300-500 (typical for WSM of this era)

Manual Type

Manual Type:

Workshop Service Manual (WSM)

Language

Language:

English

Format

Format:

Print or Digital (PDF)

📖 Manual Coverage

Systems Covered

Engine Systems:

Engine overhaul, cylinder head, piston, crankshaft, camshaft, valve train, lubrication, cooling (air-cooled), ignition system, fuel system (carburetors)

Drivetrain Systems:

Clutch, transmission (gearbox), driveshaft, final drive (bevel gear)

Chassis Systems:

Frame, suspension (front forks, rear shocks), steering, brakes (front and rear), wheels, tires

Electrical Systems:

Wiring diagrams, battery, charging system (alternator, regulator), lighting, ignition, instrumentation

Bodywork And Fittings:

Fuel tank, seat, fenders, exhaust system, controls, body panels

Procedures Included

Maintenance Procedures:

Routine checks, lubrication, filter replacement, spark plug service, brake adjustments, carburetor synchronization, valve clearance adjustment

Repair Procedures:

Engine rebuild, transmission overhaul, suspension repair, brake caliper service, electrical component replacement

Troubleshooting Guides:

Diagnosis of common problems, fault finding charts, diagnostic procedures

Special Tools And Jigs:

Identification and usage of BMW-specific tools for repair and maintenance

Technical Depth

Depth Of Coverage:

Detailed step-by-step instructions, torque specifications, clearances, technical data, diagrams, and exploded views

📊 Manual Specifications

File Format

Digital Format:

PDF (searchable text often present in higher quality scans)

Print Quality

Print Quality Description:

Clear text and legible diagrams (dependent on original source and scan quality)

Binding Type

Binding Type:

Spiral-bound or Perfect-bound (for printed versions)

Paper Type

Paper Type:

Matte or semi-gloss paper (for printed versions)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Air-cooled, four-stroke, horizontally opposed twin-cylinder (boxer)

Displacement:

897 cc (54.7 cu in)

Bore X Stroke:

90 mm x 70.6 mm (3.54 in x 2.78 in)

Compression Ratio:

9.5:1

Performance

Horsepower:

67 hp (50 kW) @ 6,500 rpm (approx.)

Torque:

77 Nm (57 lb-ft) @ 5,000 rpm (approx.)

Fuel System

Carburetors:

2 x Bing 32/40mm constant-velocity carburetors

Fuel Type:

Unleaded gasoline (91 octane or higher recommended)

Lubrication

Oil Capacity:

2.5 Liters (2.6 US qt)

Oil Type:

SAE 20W-50 or 10W-40 motorcycle specific

🔧 Transmission

Standard

Transmission Type:

5-speed manual, constant mesh

Features

Drive Type:

Shaft drive

Final Drive Ratio:

1:3.38 (9/31 teeth)

Transmission Oil Capacity:

0.25 Liters (0.26 US qt)

Transmission Oil Type:

Gear oil, SAE 90 (API GL-4)

📐 Dimensions

Exterior

Length:

2180 mm (85.8 in)

Width:

800 mm (31.5 in) (at handlebars)

Height:

1150 mm (45.3 in) (at handlebars)

Weights

Dry Weight:

210 kg (463 lbs)

Wet Weight:

226 kg (498 lbs)

Fuel Capacity:

17 Liters (4.5 US gal), including 3 Liters reserve

Seat Height:

820 mm (32.3 in)

🛡️ Safety Features

Ratings

Safety Rating Context:

Motorcycles of this era were not subject to standardized crash test ratings like modern cars.

Active Features

Braking System:

Front: Dual 260mm discs with dual-piston calipers; Rear: 260mm drum brake

Lighting System:

Halogen headlight, taillight, brake light, turn signals

Passive Features

Frame Construction:

Steel duplex cradle frame

Wheel Type:

Wire-spoked wheels, tubed tires

💡 Technology Features

Infotainment

Infotainment Features:

N/A (Classic motorcycle, no modern infotainment systems)

Driver Assistance

Driver Assistance Systems:

N/A (Classic motorcycle, no electronic rider aids)

Connectivity

Connectivity Options:

N/A (Classic motorcycle, no electronic connectivity)

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,000-5,000 km (2,000-3,000 miles) or annually

Valve Adjustment Interval:

Every 5,000-10,000 km (3,000-6,000 miles)

Spark Plug Replacement:

Every 5,000-10,000 km (3,000-6,000 miles)

Carburetor Sync Interval:

Every 10,000-15,000 km (6,000-9,000 miles) or as needed

Fluid Specifications

Brake Fluid Type:

DOT 3 or DOT 4 (check caliper manufacturer specifications)

Final Drive Oil Viscosity:

SAE 90 Gear Oil (API GL-4)

Known Issues

Common Wear Items:

Fork seals, swingarm pivot bearings, steering head bearings, clutch wear, output shaft seal leaks

Electrical Quirks:

Aging wiring harnesses, regulator/rectifier failures, aging battery terminals

Engine Considerations:

Oil leaks from the front of the engine (timing chain cover), clutch plate wear, potential for pushrod tube seal leaks

Part Numbers

Oil Filter Part Number:

BMW Part No. 11 42 1 266 485 (or equivalent aftermarket)

📚 Vehicle History

Brand Heritage

Bmw Motorcycle History:

BMW has a long and storied history in motorcycle manufacturing, known for engineering excellence, durability, and innovation, particularly in boxer engine technology.

Model Evolution

R90 Series Development:

The R90/6 was an evolution of BMW's successful large-displacement boxer twins, offering a blend of performance, comfort, and reliability for both commuting and touring.

Production

Production Years:

1973-1976

Manufacturing Location:

Berlin, Germany (Spandau plant)

Production Numbers:

Approximately 15,549 units produced for the R90/6 model.

🏆 Awards & Recognition

Recognitions

Model Recognitions:

Widely recognized as a milestone in motorcycle design and engineering, celebrated for its durability and touring capability. Often featured in 'greatest motorcycles' lists.